System of distribution.



aw. MEYER I SYSTEM oFmsTglsunom. KPPLICATION FILED lA'N- U; 9 33.

1,';235, 585. Patemd Aug. 7,1917.

- wuvmpn ATTORNEY compensating the power factors of the sys- UNITED STATES. 1?ATEnr-:oFFioE.

rmn nicn w. MEY R, or winxmsnune, PENNSYLVANIA, Assrcnon 'ro WESTING- nousn' nnnorn c .aND' MANUFACTURING comrm, A CORPORATION or rmsnvanm.

' sxsrnnonmsrninu'rion.

Patented Aug. 7, 1917..

Applica'tioufiled January 11', 191a Serial No. 741,462.

t known that I, Fnmonion W. jectof the Emperor of Germany, and 8.,sresidnt of Wilkinsbur'g,-in the county of All' eghenyand State of Pennsylvania, have invented a, new and useful Improvement in Systems of -Distribution, of which the fol lowing is a specification.

My invention relates to .systems of electrical distribution and particularly to those in which auxiliary machines are employed in connection with induction motors for the purpose ofregulating and assisting the in duction motors in their operation, and for toms. v

The object of my invention is to provide a system of the character indicated that is particularly adapted for use when the voltage of the supply circuit is high. and in which the speed of theinduction motor and the power factor of the system, as well as" the proportion of the load upon the 'auxiliary machine when operating to assist the induction motor, may' be readily and con,-

' veniently regulated.

In another application, Serial No. 741,457 filed of even'date herewith, I-have disclosed and covered. a system of distribut1on, s1milar to that herein set torth, in which an induction motor is electrically connected to an auxiliary regulating machine, the stator.

- winding of which is adapted to serve both as means for transforming the voltage of the secondary circuit of the induction motor, and as means for adjusting the power,

factor of the system, the powenfactor adjustment being effected by chang ng the positions of, the several phase divlsions of the stator winding relatively to the stator itself-f and the commutator brushes, and the transformation ratio being changed by ad ustment of the numbers of convolutions be tween certain points of connection to the stator winding.

-In still another application, Serial No. 741,459, also filed of even date herewith, I

have disclosed and'covered another system in which; the auxiliary machine is mecham-h structionqtothat employedin the system of application, ;S ,er1al.:No. 741,457..

In certain cases, and particularly where the voltage of the supply circuit is high, it is not desirable to employ the stator wind? ing as means for transforming the voltage, and the present. system differs from those above-mentioned in that a voltageregulating transformer, is interposed in. the connections between the auxiliary machine and the sup- .the system and the proportion of the load upon the auxiliary machine. My invention is illustrated in the accompanying drawing, Figure 1 of which is a diagrammatic View of a system of distribu- "tion embodying the same, and Figs. 2 and 3 are similar 'views of modifications of the system of F ig.'1.

' The present system comprises a suitable polyphase supply circuit 1 which supplies current to the primary winding of induction motor .2 that is adapted to drive any suitable load, such as a compressor, hoist or rolling mill (not shown). The secondary winding of the induction motor is connected through itsslip rings 3 and suitable adjustable resistances 4, that are provided with an adjustable and removable connector 4:, to the armature 5 of an auxiliary machine 6, the said connections being made either to the commutator cylinder 7 of the armature, as

shown in Fig. 1, or. to the slip rings 8 thereof, as shown in Fig. 2. The auxiliary machine 6 is provided with a distributed stator winding 9 having a plurality of separate phase divisions, and in the system of Fig. 1, this winding is connected'to the commutator brushes through adjust-able resistances 12 and conductors 13 that are adjustably connected to the said resistances, but which may also be entirely disconnected therefrom. The resistances are also provided with adjustable .and' removable connections '14 whereby they may be connected in a closed circuit with the stator winding when the conductors 13 are disconnected therefrom, this system of connections being used for 'operation below synchronism substantially as set forth in application, Serial No. H1358. The purpose of the connectionsbetween the stator and the armature is to provide for voltages upon the stator wincling supplement; andinfluence the voltages inductively produced therein. The values of these impressed voltages are determined by adjustment of-the resistances "12; If desired, a transformer may be substituted for "theresistances 12, as shown in Fig. 3,and,

since current may then either be delivered from the secondary circuit of 'the induction motor to the stator winding of the auxactive convolutions in the several phase divisions of the said winding, and the positions thereoforelatively to the stator. Both of these adjustments affect the power factor of the system, but the former adjustment will have this effect only in case it is such that it tends to change the speed of the auxiliary machine, which it is prevented from doing, because it is connected with the in: duction motor and is operating in synchronism with relation thereto.

The stator winding of the auxiliary Ina-- chine may be connected and arranged to obtain any suitable, and desirable characteristics, for instance, inthe manner setforth in my application, serial No. 653,380, filed 'October 7, 1911, or the stator may be provided with a winding of the lap and wave form like that set forth in application, Serial No. 741,460, filed of even date herewith. The latter winding, however, will usually be found useful only where a largerange of regulation is desired. 1 p

The adjustment of the speed of the induction motor iseifected by'means of a voltageregulating transformer 16 that is interposed in the connections between the armature of the auxiliary machine and the supply circuit.

In the operation of the system, the induction motor is started by suitable regulation of the resistances 4, and the 'auxiliary machine is started by the application of the" proper potential .thereto from "the. transformer 16 and by regulating its speed by means of the resistances 12. If the positions of the phase divisions ofthe' stator winding of the auxiliary machine or fre-' quency changer are then properly adjusted,

the auxiliary'machine may be caused to run at the'desired speed either above or below synchronism, 'and will carry the inductlon motor along'with it without the necessity of a special synchronizing operation. The resistances 4 may then be disconnectedpand the resistances 12 employed for regulating the power'factor of the system. The resist- I 'cally coupled to the induction .motor, as shown inFig. 3,adjustment of the power 130 ances 12 are usually preferably adjusted so that the transformer 16 will cause a l ttle 'machine in order to thereby sired phase compensation.

more than thenecessary magnetizing current to flow in the system through the auxiliary;

effect the de- F or operation below synchronism, the

- stator winding may be entirely disconnected as in application, Serial No. 741,458. However, for synchronous and hypersynchronous Y operatiomthe stator winding willbe prefer ably connected to the armature. It may also 0 be advisable, under certain conditions, when operating below synchronism, to leave a certam amount of the res1stances4 1n the circuit between the secondary member 'of'the induction motor and the armature of the 1 motor is small and its speed is high. In this.

arrangement, current must always be'su'pplied to the stator winding of the auxiliary ma-chine, the value of the said currents being readily adjustable by making the connections,

directly to the transformer 16.

lVhen the induction motor is started and stopped frequently, and it is desired that it be'started promptly, it may be advisable to mechanically couple the auxiliary machine to the induction motor in any suitable manner, such as that shown in Flg. 3. In this" system, the auxiliary machine maybe caused to operate as a motor for assisting the induction motor in carrying the load,,in which case the operation of the system "will be highly efiicient, since the auxiliary machine utilizes the energy of the secondary member of the induction motor and converts it into I mechanical energy for driving the load.- The auxiliary machine may also operate as a ply circuit and applied to the secondary .125.

member of the induction motor,or as both a frequency changer and supplemental motoiz.

- When the auxiliary machine is mechani-,

system can be efie'cted only phase divisions of the stator winding of the auxiliary machine. the numbers of active convolutions, in the said stator Winding of this system does not materially afiect the power factor, as it does in systems Where the machines are only electricallygconnected, but

I it varies the'proportlon of the mechanical auxiliary machine operating as a motor to I advantage of the system.

assist the mainmotor. This is an important I claim asmy invention: I l. A system of distribution comprising a supply circuit, an induction motor supplied therefrom an auxiliary machine having. an armature'connected botht to the secondary member ofthe induction motor and to the supply circuit, and a stator winding the positions and active convolutions of'the several phase divisions of which are adjustable, means whereby var-iablejamounts of current are supplied tothe said stator winding, and

a variable ratio transformer interposed in the connections between the'armatureof the auxiliary machine and the supply circuit.

A system of distribution comprising induction. motor plied therefrom,-an auxiliary machine having an armature connected both to the secondary member of the induction motor and 'to' the supply circuit, and a stator 'winding, a plurality of adjustable resistors,

means whereby said stator winding may be supplied with varying amounts of energy directly from said 'secondarymember, and means whereby said stator winding may be ,short circuited'through said resistors and 'hence supplied-with varying amounts of energy derived from the armature of sald auxiliary machine solely by induction.

3. A system of distribution comprising a Adjustment of load carried by thethere rom, an auxiliary machine having an armature connected both to the secondary member of the induction motor and to the supply circuit, and a winding, the positions lutions of the several which are adjustable,

stator winding may be supplied with varying amounts of energy directly from said secondary member or whereby said stator -winding may be supplied with varying amounts of energy derived. from the armatureof said auxiliary machinefsolsly by induction. v

4. The combination with ,two electrical circuits and an interposed machine having a stator winding, and an armature provided with a collector and a commutator respectively connected to the said circuits, of

phase-wound stator 'and active convophase divisions of means whereby said means for varying the current inductively produced in the stator winding, andfor in;-

" p y I pp y g thereto. a variabl'u.

circuits and an interposed machine having a stator Winding, thepositions and active convolutions of the several phase divisions of which are adjustable, and an armature provided with a collector and a commutator respectively connected to of means whereby variable amounts of current are supplied to the said stator windng and whereby the said may be short-circuited."

In 1 testimony whereoffI have hereunto subscribed myname this 31st day of Decem- FRIEDRICH W. MEYER.

Witnesses: v

O'rro S. SCHAIRER,

j i. 13- B. HI

the said circuits,

stator winding 

